chore: update jest config and tests for esm

Author: joakimen

jest.config.mjs

@@ -1,6 +1,12 @@
 export default {
+  extensionsToTreatAsEsm: ['.ts'],
   testMatch: ["**/*.test.ts"],
   transform: {
-    "^.+\\.tsx?$": "ts-jest",
+    "^.+\\.tsx?$": [
+      "ts-jest",
+      {
+        useESM: true,
+      },
+    ],
   },
 }

package.json

@@ -10,7 +10,7 @@
   "scripts": {
     "build": "./build.sh && tsc",
     "watch": "tsc -w",
-    "test": "jest",
+    "test": "NODE_OPTIONS=--experimental-vm-modules jest",
     "lint": "eslint .",
     "lint:fix": "eslint --fix .",
     "prepare": "npm run build && husky",

src/index.test.ts

@@ -6,6 +6,9 @@ import "jest-cdk-snapshot"
 import * as path from "path"
 import { WebappDeploy } from "."
 import { Source } from "./source"
+import { fileURLToPath } from "url"
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
 
 test("WebappDeploy", () => {
   const app = new cdk.App()